How To Figure Roof Pitch With A Framing Square

To accurately calculate the area of your roof you must first determine its slope or pitch.

How to figure roof pitch with a framing square.

The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Finding the pitch of a roof is simple with a speed square. Framing square guides are small inexpensive metal attachments to the framing square that are locked in position on the square s edges at the pitch and run dimensions to define the roof angle and make the repeated marking of the rafters much more efficient.

So if the pitch of your roof is 7 12 place one stair gauge on the vertical part of the framing square the tongue at the 7 inches 18 cm mark and place one stair gauge on the horizontal part of the framing square the body at the 12 inches 30 cm mark. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Fix stair gauges on the framing square to mark the pitch. A 6 inch rise per foot.

How to find roof slope rafter length on a framing square how would we use our framing square to measure or to calculate the slope and rafter lengths of this historic herefordshire u k. How roof pitch is calculated. A carpenter s framing square includes some tables stamped right into the tool itself. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. This article explains how to make quick use of a framing square and its imprinted data to get some basic roof measurement data like roof pitch or slope rafter lengths and end cuts. Square guides are available at most hardware and home improvement centers. How to use a framing square and its etched on tables to figure out roof slope rafter lengths.